Hello,
i like Gübelin watches, and that is a nice piece! Movement inside is the calibre 21 (99) by Frederic Piguet. If you check the book Wristwatch Chronometers: Mechanical Precision Watches by Fritz von Osterhausen, you will find the same movement marked Gübelin.
The calibre 21 (99) was introduced in 1925 and was used by many brands(Rolex 650/651) and served a base for a few movements, among others Patek Philippe cal. 175/177.
Case for this watch was made by Gübelin, i would assume on the serial number, it was made in the mid/late 60s.
Orange